proper noun/ku.pjansk/
Kupiansk (a city, the administrative centre of Kupiansk urban hromada, Kupiansk Raion, Kharkiv Oblast, Ukraine, founded in 1655)
“a) achevé sur les lignes : […] DEBALTSOVO-KOUPIANSK (en I947^([sic]) sur Debaltsovo-Popasnaia)” — a) [work] completed on the lines: […] Debaltseve–Kupiansk (in 1947 on Debaltseve–Popasnaya)
From Russian Ку́пянск (Kúpjansk) and Ukrainian Ку́п’янськ (Kúpʺjansʹk).